yourang, In many areas if you own a dog of known protective/viscous breeds and do not post the sign and it bites someone, the attorney will say, as they prosecute/sue you, "the owner of this man killer dog failed to warn the nefarious thug that he was gonna be attacked and mauled if they chose to victimize this homeowner"... "If only my poor client had been warned...."
Brent
Brent